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DEFERRED ACQUISITION COSTS, PRESENT VALUE OF FUTURE PROFITS AND SALES INDUCEMENTS - DEFERRED ACQUISITION COSTS (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | $ 2,220.7 | $ 2,025.4
Capitalizations | 222.8 | 212.5
Amortization expense | (128.2) | (116.7)
End of period | 2,315.3 | 2,121.2
Fixed indexed annuities |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 497.4 | 450.0
Capitalizations | 56.5 | 54.6
Amortization expense | (34.8) | (31.5)
End of period | 519.1 | 473.1
Fixed interest annuities |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 41.8 | 35.9
Capitalizations | 5.0 | 6.6
Amortization expense | (3.4) | (3.2)
End of period | 43.4 | 39.3
Supplemental health |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 473.5 | 438.1
Capitalizations | 37.6 | 35.4
Amortization expense | (20.2) | (18.6)
End of period | 490.9 | 454.9
Medicare supplement |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 162.9 | 157.4
Capitalizations | 20.3 | 14.6
Amortization expense | (12.5) | (12.5)
End of period | 170.7 | 159.5
Long-term care |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 165.3 | 148.6
Capitalizations | 17.4 | 14.6
Amortization expense | (8.4) | (7.7)
End of period | 174.3 | 155.5
Interest-sensitive life |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 277.5 | 256.0
Capitalizations | 20.9 | 18.1
Amortization expense | (9.0) | (8.3)
End of period | 289.4 | 265.8
Traditional life |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 592.2 | 529.5
Capitalizations | 62.9 | 68.6
Amortization expense | (37.7) | (33.3)
End of period | 617.4 | 564.8
Funding agreements |  |
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward] |  |
Beginning of period | 10.1 | 9.9
Capitalizations | 2.2 | 0.0
Amortization expense | (2.2) | (1.6)
End of period | $ 10.1 | $ 8.3

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